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Larry Doheny Office of National Marine Sanctuaries Office of Response and Restoration Screening Level Risk Assessment Package Larry Doheny March 2013 National Oceanic and Atmospheric Administration Office of National Marine Sanctuaries Daniel J. Basta, Director Lisa Symons John Wagner Office of Response and Restoration Dave Westerholm, Director Debbie Payton Doug Helton Photo: Photograph is of Larry Doheny under its previous name Foldenfjord and may not reflect the layout of the vessel as Larry Doheny Source: http://www.photoship.co.uk/JAlbum%20Ships/Old%20Ships%20F/slides/Foldenfjord-02.html Table of Contents Project Background .......................................................................................................................................ii Executive Summary ......................................................................................................................................1 Section 1: Vessel Background Information: Remediation of Underwater Legacy Environmental Threats (RULET) .....................................................................................................2 Vessel Particulars .........................................................................................................................................2 Casualty Information .....................................................................................................................................3 Wreck Location .............................................................................................................................................4 Casualty Narrative ........................................................................................................................................4 General Notes ..............................................................................................................................................5 Wreck Condition/Salvage History ................................................................................................................5 Archaeological Assessment .........................................................................................................................5 Assessment ..................................................................................................................................................5 Background Information References ............................................................................................................6 Vessel Risk Factors ......................................................................................................................................7 Section 2: Environmental Impact Modeling ...............................................................................................13 Release Scenarios Used in the Modeling ...................................................................................................13 Oil Type for Release ...................................................................................................................................14 Oil Thickness Thresholds ............................................................................................................................14 Potential Impacts to the Water Column .......................................................................................................15 Potential Water Surface Slick ......................................................................................................................16 Potential Shoreline Impacts.........................................................................................................................19 Section 3: Ecological Resources At Risk ..................................................................................................22 Ecological Risk Factors ...............................................................................................................................25 Section 4: Socio-Economic Resources At Risk ........................................................................................30 Socio-Economic Risk Factors .....................................................................................................................34 Section 5: Overall Risk Assessment and Recommendations for Assessment, Monitoring, or Remediation ..........................................................................................................39 i Project Background The past century of commerce and warfare has left a legacy of thousands of sunken vessels along the U.S. coast. Many of these wrecks pose environmental threats because of the hazardous nature of their cargoes, presence of munitions, or bunker fuel oils left onboard. As these wrecks corrode and decay, they may release oil or hazardous materials. Although a few vessels, such as USS Arizona in Hawaii, are well- publicized environmental threats, most wrecks, unless they pose an immediate pollution threat or impede navigation, are left alone and are largely forgotten until they begin to leak. In order to narrow down the potential sites for inclusion into regional and area contingency plans, in 2010, Congress appropriated $1 million to identify the most ecologically and economically significant potentially polluting wrecks in U.S. waters. This project supports the U.S. Coast Guard and the Regional Response Teams as well as NOAA in prioritizing threats to coastal resources while at the same time assessing the historical and cultural significance of these nonrenewable cultural resources. The potential polluting shipwrecks were identified through searching a broad variety of historical sources. NOAA then worked with Research Planning, Inc., RPS ASA, and Environmental Research Consulting to conduct the modeling forecasts, and the ecological and environmental resources at risk assessments. Initial evaluations of shipwrecks located within American waters found that approximately 600-1,000 wrecks could pose a substantial pollution threat based on their age, type and size. This includes vessels sunk after 1891 (when vessels began being converted to use oil as fuel), vessels built of steel or other durable material (wooden vessels have likely deteriorated), cargo vessels over 1,000 gross tons (smaller vessels would have limited cargo or bunker capacity), and any tank vessel. Additional ongoing research has revealed that 87 wrecks pose a potential pollution threat due to the violent nature in which some ships sank and the structural reduction and demolition of those that were navigational hazards. To further screen and prioritize these vessels, risk factors and scores have been applied to elements such as the amount of oil that could be on board and the potential ecological or environmental impact. ii Executive Summary: Larry Doheny The tanker Larry Doheny, torpedoed and sunk during World War II off the southern coast of Oregon in 1942, was identified as a potential pollution threat, thus a screening-level risk assessment was conducted. The different sections of this document summarize what is known about the Larry Doheny, the results of environmental impact modeling composed of different release scenarios, the ecological and socio- economic resources that would be at risk in the event of releases, the screening-level risk scoring results and overall risk assessment, and recommendations for assessment, monitoring, or remediation. Based on this screening-level assessment, each vessel Vessel Risk Factors Risk Score was assigned a summary score calculated using the A1: Oil Volume (total bbl) seven risk criteria described in this report. For the A2: Oil Type Worst Case Discharge, Larry Doheny scores High Pollution B: Wreck Clearance Potential C1: Burning of the Ship Med with 15 points; for the Most Probable Discharge Factors C2: Oil on Water (10% of the Worse Case volume), Larry Doheny D1: Nature of Casualty scores Medium with 12 points. Given these scores, D2: Structural Breakup Archaeological NOAA would typically recommend that this site be Archaeological Assessment Not Scored Assessment considered for further assessment to determine the Wreck Orientation vessel condition, amount of oil onboard, and Depth feasibility of oil removal action. However, given the Confirmation of Site Condition Operational Other Hazardous Materials Not Scored medium/low level of data certainty and that the Factors location of this vessel is unknown, NOAA Munitions Onboard recommends that surveys of opportunity be used to Gravesite (Civilian/Military) Historical Protection Eligibility attempt to locate this vessel and that general MP WCD notations are made in the Area Contingency Plans so (10%) that if a mystery spill is reported in the general area, 3A: Water Column Resources Med Low Ecological 3B: Water Surface Resources High Med this vessel could be investigated as a source. Resources 3C: Shore Resources Med Med Outreach efforts with the technical dive community Socio- 4A: Water Column Resources Med Low as well as commercial fishermen who frequent the Economic 4B: Water Surface Resources Low Low area would be helpful to gain awareness of localized Resources 4C: Shore Resources High High spills in the general area where the vessel is believed Summary Risk Scores 15 12 lost. The determination of each risk factor is explained in the document. This summary table is found on page 40. 1 Section 1: Vessel Background Information: Remediation of Underwater Legacy Environmental Threats (RULET) SECTION 1: VESSEL BACKGROUND INFORMATION: REMEDIATION OF
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